Granted Patent
Utility
US 6,721,409 · App. 09/216,928
Network based call mute
Inventors:
Raymond Paul Dell, Greg Osterhout, Randolph Wheatley
Patented Case
View Patent ↗
Granted: Apr 13, 2004
Filed: Dec 21, 1998
Inventors
Raymond Paul Dell
Greg Osterhout
Randolph Wheatley
Assignee (at issue)
Nortel Networks Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.